Camera optical lens

ABSTRACT

The present disclosure relates to the field of optical lenses and provides a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; and an eighth lens. The camera optical lens satisfies following conditions: 3.50≤f1/f≤6.50; f2≤0; and 1.55≤n7≤1.70, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; and n7 denotes a refractive index of the seventh lens. The present disclosure can achieve ultra-thin, wide-angle lenses having a big aperture.

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, and moreparticularly, to a camera optical lens suitable for handheld terminaldevices such as smart phones or digital cameras and camera devices suchas monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand forminiature camera lens is increasing day by day, but in general thephotosensitive devices of camera lens are nothing more than ChargeCoupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor(CMOS sensor), and as the progress of the semiconductor manufacturingtechnology makes the pixel size of the photosensitive devices becomesmaller, plus the current development trend of electronic productstowards better functions and thinner and smaller dimensions, miniaturecamera lenses with good imaging quality therefore have become amainstream in the market.

In order to obtain better imaging quality, the lens that istraditionally equipped in mobile phone cameras adopts a three-piece orfour-piece lens structure, or even a five-piece or six-piece structure.Also, with the development of technology and the increase of the diversedemands of users, and as the pixel area of photosensitive devices isbecoming smaller and smaller and the requirement of the system on theimaging quality is improving constantly, an eight-piece lens structuregradually appears in lens designs. Although the common eight-piece lenshas good optical performance, its settings on refractive power, lensspacing and lens shape still have some irrationality, which results inthat the lens structure cannot achieve a high optical performance whilesatisfying design requirements for ultra-thin, wide-angle lenses havinga big aperture.

SUMMARY

In view of the problems, the present disclosure aims to provide a cameralens, which can achieve a high imaging performance while satisfyingdesign requirements for ultra-thin, wide-angle lenses.

In an embodiment, the present disclosure provides a camera optical lens.The camera optical lens includes, from an object side to an image side:a first lens; a second lens; a third lens; a fourth lens; a fifth lens;a sixth lens; a seventh lens; and an eighth lens. The camera opticallens satisfies following conditions: 3.50≤f1/f≤6.50; f2≤0; and1.55≤n7≤1.70, where f denotes a focal length of the camera optical lens;f1 denotes a focal length of the first lens; f2 denotes a focal lengthof the second lens; and n7 denotes a refractive index of the seventhlens.

The present disclosure can achieve ultra-thin, wide-angle lenses havinghigh optical performance and a big aperture, which are especiallysuitable for camera lens assembly of mobile phones and WEB camera lensesformed by CCD, CMOS and other imaging elements for high pixels.

BRIEF DESCRIPTION OF DRAWINGS

Many aspects of the exemplary embodiment can be better understood withreference to the following drawings. The components in the drawings arenot necessarily drawn to scale, the emphasis instead being placed uponclearly illustrating the principles of the present disclosure. Moreover,in the drawings, like reference numerals designate corresponding partsthroughout the several views.

FIG. 1 is a schematic diagram of a structure of a camera optical lens inaccordance with Embodiment 1 of the present disclosure;

FIG. 2 is a schematic diagram of a longitudinal aberration of the cameraoptical lens shown in FIG. 1;

FIG. 3 is a schematic diagram of a lateral color of the camera opticallens shown in FIG. 1;

FIG. 4 is a schematic diagram of a field curvature and a distortion ofthe camera optical lens shown in FIG. 1;

FIG. 5 is a schematic diagram of a structure of a camera optical lens inaccordance with Embodiment 2 of the present disclosure;

FIG. 6 is a schematic diagram of a longitudinal aberration of the cameraoptical lens shown in FIG. 5;

FIG. 7 is a schematic diagram of a lateral color of the camera opticallens shown in FIG. 5;

FIG. 8 is a schematic diagram of a field curvature and a distortion ofthe camera optical lens shown in FIG. 5;

FIG. 9 is a schematic diagram of a structure of a camera optical lens inaccordance with Embodiment 3 of the present disclosure;

FIG. 10 is a schematic diagram of a longitudinal aberration of thecamera optical lens shown in FIG. 9;

FIG. 11 is a schematic diagram of a lateral color of the camera opticallens shown in FIG. 9; and

FIG. 12 is a schematic diagram of a field curvature and a distortion ofthe camera optical lens shown in FIG. 9.

DESCRIPTION OF EMBODIMENTS

The present disclosure will hereinafter be described in detail withreference to several exemplary embodiments. To make the technicalproblems to be solved, technical solutions and beneficial effects of thepresent disclosure more apparent, the present disclosure is described infurther detail together with the figure and the embodiments. It shouldbe understood the specific embodiments described hereby is only toexplain the disclosure, not intended to limit the disclosure.

Embodiment 1

Referring to FIG. 1, the present disclosure provides a camera opticallens 10. FIG. 1 shows the camera optical lens 10 according to Embodiment1 of the present disclosure. The camera optical lens 10 includes 8lenses. Specifically, the camera optical lens 10 includes, from anobject side to an image side, an aperture S1, a first lens L1, a secondlens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixthlens L6, a seventh lens L7, and an eighth lens L8. An optical elementsuch as a glass filter (GF) can be arranged between the eighth lens L8and an image plane S1.

The first lens L1 has a positive refractive power, the second lens L2has a negative refractive power, the third lens L3 has a positiverefractive power, the fourth lens L4 has a negative refractive power,the fifth lens L5 has a negative refractive power, the sixth lens L6 hasa negative refractive power, the seventh lens L7 has a positiverefractive power, and the eighth lens L8 has a negative refractivepower.

Here, a focal length of the camera optical lens 10 is defined as f, anda focal length of the first lens L1 is defined as f1. The camera opticallens 10 should satisfy a condition of 3.50≤f1/f≤6.50. When the conditionis satisfied, a spherical aberration and the field curvature of thesystem can be effectively balanced.

A focal length of the second lens L2 is defined as f2, which satisfies acondition of f2≤0. This leads to the more appropriate distribution ofthe refractive power, thereby achieving a better imaging quality and alower sensitivity.

A refractive index of the seventh lens L7 is defined as n7, whichsatisfies a condition of 1.55≤n7≤1.70. This condition specifies therefractive index of the seventh lens. This facilitates developmenttowards ultra-thin lenses while facilitating correction of aberrations.

An on-axis thickness of the third lens L3 is defined as d5, and anon-axis distance from an image side surface of the third lens L3 to anobject side surface of the fourth lens L4 is defined as d6. The cameraoptical lens 10 should satisfy a condition of 1.50≤d5/d6≤4.00. Thiscondition specifies a ratio of the thickness of the third lens and anair space between the third lens and the fourth lens. This facilitatesreducing a total length of the optical system while achieving theultra-thin effect.

A focal length of the fifth lens L5 is defined as f5, and a focal lengthof the sixth lens L6 is defined as f6. The camera optical lens 10 shouldsatisfy a condition of 3.50≤f5/f6≤6.00. This condition specifies a ratioof the focal length of the fifth lens and the focal length of the sixthlens. This leads to the more appropriate distribution of the refractivepower, thereby achieving a better imaging quality and a lowersensitivity.

A curvature radius of the object side surface of the first lens L1 isdefined as R1, and a curvature radius of an image side surface of thefirst lens L1 is defined as R2. The camera optical lens 10 shouldsatisfy a condition of −36.07≤(R1+R2)/(R1−R2)≤−8.17. This condition canreasonably control a shape of the first lens in such a manner that thefirst lens can effectively correct aberrations of the system. As anexample, −22.54≤(R1+R2)/(R1−R2)≤−10.21.

An on-axis thickness of the first lens L1 is defined as d1, and a totaloptical length from an object side surface of the first lens to an imageplane of the camera optical lens along an optic axis is defined as TTL.The camera optical lens 10 should satisfy a condition of0.02≤d1/TTL≤0.10. This condition can facilitate achieving ultra-thinlenses. As an example, 0.03≤d1/TTL≤0.08.

The focal length of the camera optical lens 10 is defined as f, and thefocal length of the second lens L2 is defined as f2. The camera opticallens 10 should satisfy a condition of −443.09≤f2/f≤−22.52. Thiscondition can facilitate correction aberrations of the optical system bycontrolling a negative refractive power of the second lens L2 within areasonable range. As an example, −276.93≤f2/f≤−28.15.

A curvature radius of an object side surface of the second lens L2 isdefined as R3, and a curvature radius of an image side surface of thesecond lens L2 is defined as R4. The camera optical lens 10 shouldsatisfy a condition of 18.63≤(R3+R4)/(R3−R4)≤141.75, which specifies ashape of the second lens L2. This can facilitate correction of anoff-axis aberration with development towards ultra-thin lenses. As anexample, 29.81≤(R3+R4)/(R3−R4)≤113.40.

An on-axis thickness of the second lens L2 is defined as d3. The cameraoptical lens 10 should satisfy a condition of 0.01≤d3/TTL≤0.04. Thiscondition can facilitate achieving ultra-thin lenses. As an example,0.02≤d3/TTL≤0.03.

The focal length of the camera optical lens 10 is defined as f, and thefocal length of the third lens L3 is defined as f3. The camera opticallens 10 should satisfy a condition of 0.50≤f3/f≤1.59. This condition canlead to the more appropriate distribution of the refractive power,thereby achieving a better imaging quality and a lower sensitivity. Asan example, 0.80≤f3/f≤1.27.

A curvature radius of an object side surface of the third lens L3 isdefined as R5, and a curvature radius of an image side surface of thethird lens L3 is defined as R6. The camera optical lens 10 shouldsatisfy a condition of −0.41≤(R5+R6)/(R5−R6)≤0.12, which specifies ashape of the third lens. This condition can alleviate the deflection oflight passing through the lens while effectively reducing aberrations.As an example, −0.25≤(R5+R6)/(R5−R6)≤−0.15.

An on-axis thickness of the third lens L3 is defined as d5. The cameraoptical lens 10 should satisfy a condition of 0.05≤d5/TTL≤0.15. Thiscondition can facilitate achieving ultra-thin lenses. As an example,0.07≤d5/TTL≤0.12.

The focal length of the camera optical lens 10 is defined as f, and thefocal length of the fourth lens L4 is defined as f4. The camera opticallens 10 should satisfy a condition of −7.30≤f4/f≤−2.34, which specifiesa ratio of the focal length of the fourth lens and the focal length ofthe camera optical lens. This condition can facilitate improving theoptical performance of the system. As an example, −4.56≤f4/f≤−2.92.

A curvature radius of an object side surface of the fourth lens L4 isdefined as R7, and a curvature radius of an image side surface of thefourth lens L4 is defined as R8. The camera optical lens 10 shouldsatisfy a condition of 1.62≤(R7+R8)/(R7−R8)≤5.02, which specifies ashape of the fourth lens L4. This can facilitate correction of anoff-axis aberration with development towards ultra-thin lenses. As anexample, 2.59≤(R7+R8)/(R7−R8)≤4.01.

An on-axis thickness of the fourth lens L4 is defined as d7. The cameraoptical lens 10 should satisfy a condition of 0.01≤d7/TTL≤0.05. Thiscondition can facilitate achieving ultra-thin lenses. As an example,0.02≤d7/TTL≤0.04.

The focal length of the camera optical lens 10 is defined as f, and thefocal length of the fifth lens L5 is defined as f5. The camera opticallens 10 should satisfy a condition of −28.44≤f5/f≤−7.69. This conditioncan effectively make a light angle of the camera optical lens gentle andreduce the tolerance sensitivity. As an example, −17.77≤f5/f≤−9.62.

A curvature radius of an object side surface of the fifth lens L5 isdefined as R9, and a curvature radius of an image side surface of thefifth lens L5 is defined as R10. The camera optical lens 10 shouldsatisfy a condition of 1.86≤(R9+R10)/(R9−R10)≤6.84, which specifies ashape of the fifth lens L5. This can facilitate correction of anoff-axis aberration with development towards ultra-thin lenses. As anexample, 2.98≤(R9+R10)/(R9−R10)≤5.47.

An on-axis thickness of the fifth lens L5 is defined as d9. The cameraoptical lens 10 should satisfy a condition of 0.02≤d9/TTL≤0.05. Thiscondition can facilitate achieving ultra-thin lenses. As an example,0.02≤d9/TTL≤0.04.

The focal length of the camera optical lens 10 is defined as f, and thefocal length of the sixth lens L6 is defined as f6. The camera opticallens 10 should satisfy a condition of −6.18≤f6/f≤−1.68. This conditioncan lead to the more appropriate distribution of the refractive power,thereby achieving a better imaging quality and a lower sensitivity. Asan example, −3.86≤f6/f≤−2.10.

A curvature radius of an object side surface of the sixth lens L6 isdefined as R11, and a curvature radius of an image side surface of thesixth lens L6 is defined as R12. The camera optical lens 10 shouldsatisfy a condition of 2.04≤(R11+R12)/(R11−R12)≤7.94, which specifies ashape of the sixth lens L6. This can facilitate correction of anoff-axis aberration with development towards ultra-thin lenses. As anexample, 3.27≤(R11+R12)/(R11−R12)≤6.35.

An on-axis thickness of the sixth lens L6 is defined as d11. The cameraoptical lens 10 should satisfy a condition of 0.03≤d11/TTL≤0.08. Thiscondition can facilitate achieving ultra-thin lenses. As an example,0.04≤d11/TTL≤0.06.

The focal length of the camera optical lens 10 is defined as f, and thefocal length of the seventh lens L7 is defined as P. The camera opticallens 10 should satisfy a condition of 0.46≤f7/f≤1.47. This condition canlead to the more appropriate distribution of the refractive power,thereby achieving a better imaging quality and a lower sensitivity. Asan example, 0.73≤f7/f≤1.17.

A curvature radius of an object side surface of the seventh lens L7 isdefined as R13, and a curvature radius of an image side surface of theseventh lens L7 is defined as R14. The camera optical lens 10 shouldsatisfy a condition of −3.72≤(R13+R14)/(R13−R14)≤−0.82, which specifiesa shape of the seventh lens L7. This can facilitate correction of anoff-axis aberration with development towards ultra-thin lenses. As anexample, −2.33≤(R13+R14)/(R13−R14)≤−1.02.

An on-axis thickness of the seventh lens L7 is defined as d13. Thecamera optical lens 10 should satisfy a condition of 0.04≤d13/TTL≤0.20.This condition can facilitate achieving ultra-thin lenses. As anexample, 0.07≤d13/TTL≤0.16.

The focal length of the camera optical lens 10 is defined as f, and thefocal length of the eighth lens L8 is defined as f8. The camera opticallens 10 should satisfy a condition of −1.51≤f8/f≤−0.43. This conditioncan lead to the more appropriate distribution of the refractive power,thereby achieving a better imaging quality and a lower sensitivity. Asan example, −0.94≤f8/f≤−0.53.

A curvature radius of an object side surface of the eighth lens L8 isdefined as R15, and a curvature radius of an image side surface of theeighth lens L8 is defined as R16. The camera optical lens 10 shouldsatisfy a condition of −0.94≤(R15+R16)/(R15−R16)≤−0.19, which specifiesa shape of the eighth lens L8. This can facilitate correction of anoff-axis aberration with development towards ultra-thin lenses. As anexample, −0.59≤(R15+R16)/(R15−R16)≤−0.24.

An on-axis thickness of the eighth lens L8 is defined as d15. The cameraoptical lens 10 should satisfy a condition of 0.04≤d15/TTL≤0.22. Thiscondition can facilitate achieving ultra-thin lenses. As an example,0.06≤d15/TTL≤0.17.

In this embodiment, an image height of the camera optical lens 10 isdefined as IH. The camera optical lens 10 should satisfy a condition ofTTL/IH≤1.40. This condition can facilitate achieving ultra-thin lenses.

In this embodiment, an F number of the camera optical lens 10 is smallerthan or equal to 2.0, thereby leading to a big aperture and high imagingperformance.

When the focal length of the camera optical lens 10, the focal lengthsof respective lenses, the refractive index of the seventh lens, theon-axis thicknesses of respective lenses, the TTL, and the curvatureradius of object side surfaces and image side surfaces of respectivelenses satisfy the above conditions, the camera optical lens 10 willhave high optical performance while achieving ultra-thin, wide-anglelenses having a big aperture. The camera optical lens 10 is especiallysuitable for camera lens assembly of mobile phones and WEB camera lensesformed by CCD, CMOS and other imaging elements for high pixels.

In the following, examples will be used to describe the camera opticallens 10 of the present disclosure. The symbols recorded in each examplewill be described as follows. The focal length, on-axis distance,curvature radius, on-axis thickness, inflexion point position, andarrest point position are all in units of mm.

TTL: Optical length (the total optical length from the object sidesurface of the first lens L1 to the image plane of the camera opticallens along the optic axis) in mm.

In an example, inflexion points and/or arrest points can be arranged onthe object side surface and/or image side surface of the lens, so as tosatisfy the demand for the high quality imaging. The description belowcan be referred to for specific implementations.

Table 1 and Table 2 show design data of the camera optical lens 10according to Embodiment 1 of the present disclosure.

TABLE 1 R d nd vd S1 ∞  d0= −0.555 R1 3.200  d1= 0.619 nd1 1.5444 v155.82 R2 3.769  d2= 0.418 R3 7.078  d3= 0.248 nd2 1.6420 v2 22.41 R46.708  d4= 0.021 R5 7.190  d5= 0.910 nd3 1.5444 v3 55.82 R6 −10.772  d6=0.229 R7 15.983  d7= 0.291 nd4 1.6359 v4 23.82 R8 8.516  d8= 0.693 R939.905  d9= 0.300 nd5 1.6153 v5 25.94 R10 25.321 d10= 0.414 R11 8.110d11= 0.515 nd6 1.6610 v6 20.53 R12 4.923 d12= 0.480 R13 3.524 d13= 1.005nd7 1.5661 v7 37.71 R14 16.819 d14= 1.306 R15 −4.757 d15= 1.396 nd81.5844 v8 28.22 R16 12.967 d16= 0.383 R17 ∞ d17= 0.210 ndg 1.5168 vg64.21 R18 ∞ d18= 0.285

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: curvature radius of an optical surface, a central curvature radiusfor a lens;

R1: curvature radius of the object side surface of the first lens L1;

R2: curvature radius of the image side surface of the first lens L1;

R3: curvature radius of the object side surface of the second lens L2;

R4: curvature radius of the image side surface of the second lens L2;

R5: curvature radius of the object side surface of the third lens L3;

R6: curvature radius of the image side surface of the third lens L3;

R7: curvature radius of the object side surface of the fourth lens L4;

R8: curvature radius of the image side surface of the fourth lens L4;

R9: curvature radius of the object side surface of the fifth lens L5;

R10: curvature radius of the image side surface of the fifth lens L5;

R11: curvature radius of the object side surface of the sixth lens L6;

R12: curvature radius of the image side surface of the sixth lens L6;

R13: curvature radius of the object side surface of the seventh lens L7;

R14: curvature radius of the image side surface of the seventh lens L7;

R15: curvature radius of the object side surface of the eighth lens L8;

R16: curvature radius of the image side surface of the eighth lens L8;

R17: curvature radius of an object side surface of the optical filterGF;

R18: curvature radius of an image side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

d0: on-axis distance from the aperture S1 to the object side surface ofthe first lens L1;

d1: on-axis thickness of the first lens L1;

d2: on-axis distance from the image side surface of the first lens L1 tothe object side surface of the second lens L2;

d3: on-axis thickness of the second lens L2;

d4: on-axis distance from the image side surface of the second lens L2to the object side surface of the third lens L3;

d5: on-axis thickness of the third lens L3;

d6: on-axis distance from the image side surface of the third lens L3 tothe object side surface of the fourth lens L4;

d7: on-axis thickness of the fourth lens L4;

d8: on-axis distance from the image side surface of the fourth lens L4to the object side surface of the fifth lens L5;

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image side surface of the fifth lens L5to the object side surface of the sixth lens L6;

d11: on-axis thickness of the sixth lens L6;

d12: on-axis distance from the image side surface of the sixth lens L6to the object side surface of the seventh lens L7;

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image side surface of the seventh lens L7to the object side surface of the eighth lens L8;

d15: on-axis thickness of the eighth lens L8;

d16: on-axis distance from the image side surface of the eighth lens L8to the object side surface of the optical filter GF;

d17: on-axis thickness of the optical filter GF;

d18: on-axis distance from the image side surface of the optical filterGF to the image plane;

nd: refractive index of d line;

nd1: refractive index of d line of the first lens L1;

nd2: refractive index of d line of the second lens L2;

nd3: refractive index of d line of the third lens L3;

nd4: refractive index of d line of the fourth lens L4;

nd5: refractive index of d line of the fifth lens L5;

nd6: refractive index of d line of the sixth lens L6;

nd7: refractive index of d line of the seventh lens L7;

nd8: refractive index of d line of the eighth lens L8;

ndg: refractive index of d line of the optical filter GF;

vd: abbe number;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

v6: abbe number of the sixth lens L6;

v7: abbe number of the seventh lens L7;

v8: abbe number of the eighth lens L8;

vg: abbe number of the optical filter GF.

Table 2 shows aspheric surface data of respective lens in the cameraoptical lens 10 according to Embodiment 1 of the present disclosure.

TABLE 2 Conic Aspherical coefficient surface coefficients k A 4 A6 A8A10 A12 R1 −9.9685E−01  6.1805E−04 −1.8932E−04 −1.1334E−03  1.2581E−03−7.9889E−04 R2 −6.6591E−01 −1.6988E−03 −3.1667E−03  2.9088E−03−2.7542E−03  1.6630E−03 R3  9.8275E+00 −1.1700E−02 −1.1170E−02 9.8913E−03 −5.3306E−03  1.7167E−03 R4 −1.5088E+01  3.0971E−02−6.8115E−02  6.7567E−02 −4.0644E−02  1.5811E−02 R5  1.0236E+01 3.2052E−02 −6.6763E−02  6.3611E−02 −3.5755E−02  1.2183E−02 R6−8.0872E−02 −7.3508E−03 −7.5822E−04  1.9471E−03 −1.2247E−03  4.8673E−04R7  3.5638E+01 −1.3093E−03 −2.5900E−03  3.4421E−03 −1.7082E−03 4.5484E−04 R8  7.8998E+00  2.1853E−03 −2.5860E−03  2.1855E−03−8.5128E−04  1.3350E−04 R9  6.9808E+01  9.7710E−03 −1.6648E−02 5.5988E−03 −1.9707E−05 −7.4025E−04 R10  9.6468E+01  1.7987E−02−2.1519E−02  7.8011E−03 −1.3170E−03 −8.3724E−05 R11 −1.0495E+02 9.7547E−03 −4.0108E−03  7.7304E−04 −1.1397E−04  1.7020E−05 R12−3.8647E+01 −1.1786E−02  5.1844E−03 −1.9243E−03  4.8665E−04 −8.2664E−05R13 −1.0966E+01 −2.8439E−03 −3.5302E−06 −1.4051E−04  2.3946E−05−2.6626E−06 R14 −4.1844E+01 −1.5470E−03 −1.3963E−04 −4.3704E−05 4.7240E−06 −7.3605E−08 R15 −5.9445E−01 −1.1137E−02  1.4074E−03−9.7855E−05  9.3599E−06 −7.5813E−07 R16  2.5911E+00 −7.2612E−03 2.6355E−04  1.2197E−05 −2.1420E−06  1.2854E−07 Aspherical surfacecoefficients A14 A16 A18 A20 R1  2.9141E−04 −6.2925E−05  7.4933E−06−3.8072E−07 R2 −6.5113E−04  1.5441E−04 −1.9343E−05  9.3761E−07 R3−2.7802E−04  2.5650E−06  6.3237E−06 −7.4321E−07 R4 −4.0312E−03 6.5881E−04 −6.3382E−05  2.7354E−06 R5 −2.4602E−03  2.5905E−04−7.8829E−06 −5.0524E−07 R6 −1.3272E−04  2.4536E−05 −2.7887E−06 1.4383E−07 R7 −5.9025E−05  4.0245E−07  7.2248E−07 −5.6480E−08 R8 1.3431E−05 −8.9217E−06  1.3198E−06 −6.8706E−08 R9  2.9776E−04−5.7860E−05  5.7904E−06 −2.3813E−07 R10  8.6496E−05 −1.7491E−05 1.6179E−06 −5.8352E−08 R11 −3.4329E−06  5.0395E−07 −3.8546E−08 1.1678E−09 R12  9.0340E−06 −6.0435E−07  2.2449E−08 −3.5382E−10 R13 2.0018E−07 −7.9092E−09  9.2917E−11  1.5832E−12 R14 −9.1964E−09 4.9536E−10 −9.0251E−12  4.9261E−14 R15  3.6741E−08 −1.0126E−09 1.4831E−11 −9.0374E−14 R16 −4.4666E−09  9.2660E−11 −1.0437E−12 4.7947E−15

In Table 2, k is a conic coefficient, and A4, A6, A8, A10, A12, A14,A16, A18 and A20 are aspheric surface coefficients.

IH: Image Height

y=(x ² /R)/[1+{1−(k+1)(x ² /R ²)}^(1/2)]+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰+A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰  (1)

In the present embodiment, an aspheric surface of each lens surface usesthe aspheric surfaces shown in the above condition (1). However, thepresent disclosure is not limited to the aspherical polynomials formshown in the condition (1).

Table 3 and Table 4 show design data of inflexion points and arrestpoints of respective lens in the camera optical lens 10 according toEmbodiment 1 of the present disclosure. P1R1 and P1R2 represent theobject side surface and the image side surface of the first lens L1,respectively, P2R1 and P2R2 represent the object side surface and theimage side surface of the second lens L2, respectively, P3R1 and P3R2represent the object side surface and the image side surface of thethird lens L3, respectively, P4R1 and P4R2 represent the object sidesurface and the image side surface of the fourth lens L4, respectively,P5R1 and P5R2 represent the object side surface and the image sidesurface of the fifth lens L5, respectively, P6R1 and P6R2 represent theobject side surface and the image side surface of the sixth lens L6,respectively, P7R1 and P7R2 represent the object side surface and theimage side surface of the seventh lens L7, respectively, and P8R1 andP8R2 represent the object side surface and the image side surface of theeighth lens L8, respectively. The data in the column named “inflexionpoint position” refers to vertical distances from inflexion pointsarranged on each lens surface to the optic axis of the camera opticallens 10. The data in the column named “arrest point position” refers tovertical distances from arrest points arranged on each lens surface tothe optic axis of the camera optical lens 10.

TABLE 3 Number Inflexion Inflexion Inflexion of point point pointinflexion position position position points 1 2 3 P1R1 1 1.695 P1R2 11.515 P2R1 1 0.935 P2R2 1 1.675 P3R1 2 1.825 2.055 P3R2 0 P4R1 1 1.925P4R2 1 2.005 P5R1 1 0.695 P5R2 2 0.845 2.355 P6R1 2 1.395 3.075 P6R2 30.945 3.535 3.585 P7R1 2 1.295 3.695 P7R2 1 1.235 P8R1 2 2.745 4.505P8R2 1 1.015

TABLE 4 Number Arrest Arrest of arrest point point points position 1position 2 P1R1 0 P1R2 0 P2R1 1 1.915 P2R2 1 1.995 P3R1 0 P3R2 0 P4R1 12.225 P4R2 1 2.345 P5R1 1 1.035 P5R2 2 1.285 2.535 P6R1 1 2.165 P6R2 12.155 P7R1 1 2.295 P7R2 1 1.975 P8R1 0 P8R2 1 1.865

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateralcolor of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and450 nm after passing the camera optical lens 10 according toEmbodiment 1. FIG. 4 illustrates a field curvature and a distortion oflight with a wavelength of 546 nm after passing the camera optical lens10 according to Embodiment 1, in which a field curvature S is a fieldcurvature in a sagittal direction and T is a field curvature in atangential direction.

Table 13 below further lists various values of Embodiments 1, 2, and 3and values corresponding to parameters which are specified in the aboveconditions.

As shown in Table 13, Embodiment 1 satisfies respective conditions.

In this embodiment, the entrance pupil diameter of the camera opticallens is 3.973 mm. The image height of 1.0H is 8.00 mm. The FOV (field ofview) is 90.60°. Thus, the camera optical lens can achieve ultra-thin,wide-angle lenses while having on-axis and off-axis aberrationssufficiently corrected, thereby leading to better opticalcharacteristics.

Embodiment 2

Embodiment 2 is basically the same as Embodiment 1 and involves symbolshaving the same meanings as Embodiment 1, and only differencestherebetween will be described in the following.

Table 5 and Table 6 show design data of a camera optical lens 20 inEmbodiment 2 of the present disclosure.

TABLE 5 R d nd vd S1 ∞  d0= −0.399 R1 3.702  d1= 0.303 nd1 1.5444 vi55.82 R2 4.184  d2= 0.418 R3 6.804  d3= 0.252 nd2 1.6501 v2 21.44 R46.560  d4= 0.020 R5 7.007  d5= 0.956 nd3 1.5444 v3 55.82 R6 −10.574  d6=0.265 R7 16.160  d7= 0.260 nd4 1.6700 v4 19.39 R8 8.530  d8= 0.899 R939.734  d9= 0.300 nd5 1.6700 v5 19.39 R10 25.444 d10= 0.460 R11 6.619d11= 0.505 nd6 1.6359 v6 23.82 R12 4.425 d12= 0.591 R13 3.532 d13= 1.263nd7 1.5661 v7 37.71 R14 35.004 d14= 1.591 R15 −4.536 d15= 0.700 nd81.5844 v8 28.22 R16 12.587 d16= 0.383 R17 ∞ d17= 0.210 ndg 1.5168 vg64.21 R18 ∞ d18= 0.253

Table 6 shows aspheric surface data of respective lenses in the cameraoptical lens 20 according to Embodiment 2 of the present disclosure.

TABLE 6 Conic Aspherical surface coefficient coefficients k A4 A6 A8 A10A12 A14 A16 A18 A20 R1 −1.3989E+00  3.3247E−04 −2.9922E−03  3.3996E−03−3.1639E−03  1.7851E−03 −6.4389E−04  1.4375E−04 −1.7938E−05  9.4128E−07R2 −4.0814E−01 −1.5320E−03 −5.0265E−03  6.5291E−03 −6.4439E−03 4.0322E−03 −1.6138E−03  3.9916E−04 −5.4726E−05  3.1193E−06 R3 9.6697E+00 −1.1045E−02 −1.0854E−02  9.7806E−03 −6.3284E−03  2.8549E−03−8.7358E−04  1.7465E−04 −2.0116E−05  9.2357E−07 R4 −1.5053E+01 3.1827E−02 −6.6602E−02  6.4256E−02 −3.7739E−02  1.4259E−02 −3.5195E−03 5.6313E−04 −5.4794E−05  2.5181E−06 R5  1.0108E+01  3.2212E−02−6.6754E−02  6.3609E−02 −3.5756E−02  1.2183E−02 −2.4604E−03  2.5899E−04−7.9017E−06 −5.1187E−07 R6  1.7218E+00 −7.5507E−03 −7.6379E−04 1.9367E−03 −1.2287E−03  4.8554E−04 −1.3292E−04  2.4495E−05 −2.7950E−06 1.4358E−07 R7  3.7230E+01 −1.4120E−03 −2.6016E−03  3.4503E−03−1.7052E−03  4.5593E−04 −5.8996E−05  4.0458E−07  7.2430E−07 −5.5423E−08R8  7.9098E+00  2.1377E−03 −2.5770E−03  2.1850E−03 −8.5009E−04 1.3405E−04  1.3467E−05 −8.9080E−06  1.3220E−06 −6.8928E−08 R9 1.4581E+02  1.0285E−02 −1.6678E−02  5.5951E−03 −1.7474E−05 −7.3928E−04 2.9781E−04 −5.7850E−05  5.7918E−06 −2.3807E−07 R10  9.5250E+01 1.7529E−02 −2.1539E−02  7.8031E−03 −1.3164E−03 −8.3645E−05  8.6507E−05−1.7490E−05  1.6182E−06 −5.8243E−08 R11 −6.6518E+01  1.0546E−02−4.0150E−03  7.7324E−04 −1.1374E−04  1.7025E−05 −3.4346E−06  5.0381E−07−3.8567E−08  1.1639E−09 R12 −3.0536E+01 −1.1601E−02  5.2311E−03−1.9254E−03  4.8647E−04 −8.2672E−05  9.0337E−06 −6.0435E−07  2.2451E−08−3.5358E−10 R13 −9.9372E+00 −2.0865E−03  7.0913E−05 −1.4145E−04 2.3836E−05 −2.6654E−06  2.0014E−07 −7.9096E−09  9.2844E−11  1.5697E−12R14  2.3307E+01 −5.7732E−04 −1.3657E−04 −4.3932E−05  4.7012E−06−7.4743E−08 −9.2414E−09  4.9298E−10 −9.1746E−12  3.9891E−14 R15−6.4007E−01 −1.0746E−02  1.3983E−03 −9.8296E−05  9.3495E−06 −7.5834E−07 3.6738E−08 −1.0126E−09  1.4825E−11 −9.1072E−14 R16  2.8938E+00−7.0729E−03  2.6433E−04 1.2313E−05 −2.1431E−06  1.2851E−07 −4.4673E−09 9.2649E−11 −1.0442E−12  4.7734E−15

Table 7 and Table 8 show design data of inflexion points and arrestpoints of respective lens in the camera optical lens 20 according toEmbodiment 2 of the present disclosure.

TABLE 7 Number of Inflexion Inflexion Inflexion inflexion point pointpoint points position 1 position 2 position 3 P1R1 1 1.575 P1R2 1 1.705P2R1 3 0.975 1.605 1.785 P2R2 2 1.805 1.965 P3R1 2 1.755 2.005 P3R2 0P4R1 1 2.235 P4R2 1 2.145 P5R1 1 0.715 P5R2 2 0.835 2.315 P6R1 1 1.505P6R2 2 1.015 3.475 P7R1 2 1.405 3.755 P7R2 1 1.285 P8R1 2 2.755 3.995P8R2 1 1.055

TABLE 8 Number of Arrest point Arrest point arrest points position 1position 2 P1R1 0 P1R2 0 P2R1 0 P2R2 0 P3R1 0 P3R2 0 P4R1 0 P4R2 0 P5R11 1.065 P5R2 1 1.255 P6R1 1 2.305 P6R2 1 2.335 P7R1 2 2.465 4.085 P7R2 11.925 P8R1 0 P8R2 1 1.965

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateralcolor of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and450 nm after passing the camera optical lens 20 according to Embodiment2. FIG. 8 illustrates a field curvature and a distortion of light with awavelength of 546 nm after passing the camera optical lens 20 accordingto Embodiment 2.

As shown in Table 13, Embodiment 2 satisfies respective conditions.

In this embodiment, the entrance pupil diameter of the camera opticallens is 3.795 mm. The image height of 1.0H is 7.30 mm. The FOV (field ofview) is 87.60°. Thus, the camera optical lens can achieve ultra-thin,wide-angle lenses while having on-axis and off-axis aberrationssufficiently corrected, thereby leading to better opticalcharacteristics.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1 and involves symbolshaving the same meanings as Embodiment 1, and only differencestherebetween will be described in the following.

Table 9 and Table 10 show design data of a camera optical lens 30 inEmbodiment 3 of the present disclosure.

TABLE 9 R d nd vd S1 ∞  d0= −0.497 R1 3.177  d1= 0.396 nd1 1.5444 v155.82 R2 3.550  d2= 0.455 R3 6.876  d3= 0.261 nd2 1.6700 v2 19.39 R46.732  d4= 0.020 R5 7.194  d5= 0.860 nd3 1.5444 v3 55.82 R6 −10.388  d6=0.546 R7 15.673  d7= 0.301 nd4 1.6700 v4 19.39 R8 8.457  d8= 0.710 R943.438  d9= 0.300 nd5 1.6501 v5 21.44 R10 25.064 d10= 0.489 R11 6.619d11= 0.511 nd6 1.6700 v6 19.39 R12 4.515 d12= 0.483 R13 3.79 d13= 0.846nd7 1.6700 v7 19.39 R14 12.599 d14= 1.688 R15 −5.402 d15= 0.700 nd81.6700 v8 19.39 R16 9.736 d16= 0.383 R17 ∞ d17= 0.210 ndg 1.5168 vg64.21 R18 ∞ d18= 0.323

Table 10 shows aspheric surface data of respective lenses in the cameraoptical lens 30 according to Embodiment 3 of the present disclosure.

TABLE 10 Conic Aspherical coefficient surface coefficients k A4 A6 A8A10 A12 A14 A16 A18 A20 R1 −1.1735E+00  2.0977E−03 −5.3809E−03 5.8915E−03 −4.6247E−03  2.2968E−03 −7.3781E−04  1.4660E−04 −1.6282E−05 7.6326E−07 R2 −5.7017E−01 −1.0513E−03 −7.8353E−03  1.1582E−02−1.1955E−02  7.6407E−03 −3.0300E−03  7.2112E−04 −9.3343E−05  4.9855E−06R3  9.7444E+00 −9.6605E−03 −1.1860E−02  1.0174E−02 −6.6390E−03 3.0120E−03 −8.6719E−04  1.4370E−04 −1.0553E−05  1.1868E−08 R4−1.4285E+01  3.2660E−02 −6.6877E−02  6.5700E−02 −4.0708E−02  1.6732E−02−4.5959E−03  8.1949E−04 −8.6074E−05  4.0198E−06 R5  1.0214E+01 3.2155E−02 −6.6738E−02  6.3613E−02 −3.5756E−02  1.2183E−02 −2.4603E−03 2.5904E−04 −7.8847E−06 −5.0541E−07 R6 −6.6192E−01 −7.2559E−03−8.2487E−04  1.9325E−03 −1.2267E−03  4.8627E−04 −1.3273E−04  2.4528E−05−2.7933E−06  1.4232E−07 R7  3.8043E+01 −9.6447E−04 −2.5939E−03 3.4472E−03 −1.7054E−03  4.5603E−04 −5.8988E−05  4.0749E−07  7.2422E−07−5.5494E−08 R8  7.8538E+00  1.7470E−03 −2.5100E−03  2.1986E−03−8.4932E−04  1.3382E−04  1.3405E−05 −8.9132E−06  1.3210E−06 −6.7667E−08R9  1.4948E+02  1.1783E−02 −1.6777E−02  5.5801E−03 −1.8212E−05−7.3922E−04  2.9783E−04 −5.7862E−05  5.7898E−06 −2.3713E−07 R10 9.8509E+01  1.7199E−02 −2.1441E−02  7.8071E−03 −1.3170E−03 −8.3725E−05 8.6515E−05 −1.7482E−05  1.6190E−06 −5.8174E−08 R11 −5.8367E+01 1.0847E−02 −4.0510E−03  7.7463E−04 −1.1360E−04  1.7005E−05 −3.4380E−06 5.0323E−07 −3.8636E−08  1.1540E−09 R12 −3.4746E+01 −1.0589E−02 5.2753E−03 −1.9281E−03  4.8621E−04 −8.2691E−05  9.0327E−06 −6.0439E−07 2.2453E−08 −3.5311E−10 R13 −1.5169E+01 −3.1069E−03 −5.0507E−07−1.4286E−04  2.3841E−05 −2.6613E−06  2.0058E−07 −7.8739E−09  9.5216E−11 1.7214E−12 R14  1.0232E+00 −1.5692E−03 −1.6004E−04 −4.3801E−05 4.6867E−06 −7.7166E−08 −9.3750E−09  4.8982E−10 −9.0403E−12  6.3321E−14R15 −4.3989E−01 −1.1494E−02  1.3884E−03 −9.7915E−05  9.3557E−06−7.5850E−07  3.6720E−08 −1.0136E−09  1.4793E−11 −9.0750E−14 R16−2.9327E+01 −9.1803E−03  3.0185E−04  1.2199E−05 −2.1452E−06  1.2866E−07−4.4609E−09  9.2733E−11 −1.0478E−12  4.4006E−15

Table 11 and Table 12 show design data of inflexion points and arrestpoints of respective lens in the camera optical lens 30 according toEmbodiment 3 of the present disclosure.

TABLE 11 Number of Inflexion Inflexion Inflexion Inflexion inflex- pointpoint point point ion position position position position points 1 2 3 4P1R1 1 1.635 P1R2 1 1.735 P2R1 4 0.955 1.595 1.835 2.045 P2R2 1 1.815P3R1 2 1.795 2.075 P3R2 0 P4R1 1 2.315 P4R2 1 2.325 P5R1 1 0.735 P5R2 20.835 2.245 P6R1 1 1.525 P6R2 1 1.095 P7R1 2 1.205 3.465 P7R2 1 1.495P8R1 2 2.835 3.795 P8R2 1 0.865

TABLE 12 Number of Arrest point Arrest point arrest points position 1position 2 P1R1 0 P1R2 1 2.035 P2R1 1 1.965 P2R2 0 P3R1 0 P3R2 0 P4R1 0P4R2 0 P5R1 1 1.095 P5R2 2 1.265 2.445 P6R1 1 2.315 P6R2 1 2.505 P7R1 22.175 3.865 P7R2 1 2.305 P8R1 0 P8R2 1 1.565

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateralcolor of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and450 nm after passing the camera optical lens 30 according to Embodiment3. FIG. 12 illustrates field curvature and distortion of light with awavelength of 546 nm after passing the camera optical lens 30 accordingto Embodiment 3.

Table 13 below further lists various values of the present embodimentand values corresponding to parameters which are specified in the aboveconditions. Obviously, the camera optical lens according to thisembodiment satisfies the above conditions.

In this embodiment, the entrance pupil diameter of the camera opticallens is 4.033 mm. The image height of 1.0H is 6.80 mm. The FOV (field ofview) is 80.00°. Thus, the camera optical lens can achieve ultra-thin,wide-angle lenses while having on-axis and off-axis aberrationssufficiently corrected, thereby leading to better opticalcharacteristics.

TABLE 13 Parameters and Embodi- Embodi- Embodi- Conditions ment 1 ment 2ment 3 f1/f 3.52 6.49 5.11 f2 −268.38 −469.71 −1742.25 n7 1.57 1.57 1.67f 7.946 7.400 7.864 f1 27.980 48.047 40.199 f3 8.031 7.860 7.911 f4−28.821 −27.009 −27.547 f5 −112.474 −105.217 −90.739 f6 −20.039 −22.848−23.231 f7 7.617 6.797 7.694 f8 −5.738 −5.574 −5.029 f12 30.447 52.40940.448 Fno 2.00 1.95 1.95

Fno denotes an F number of the camera optical lens.

It can be appreciated by one having ordinary skill in the art that thedescription above is only embodiments of the present disclosure. Inpractice, one having ordinary skill in the art can make variousmodifications to these embodiments in forms and details withoutdeparting from the spirit and scope of the present disclosure.

What is claimed is:
 1. A camera optical lens, comprising, from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; and an eighth lens, wherein the camera optical lens satisfies following conditions: 3.50≤f1/f≤6.50; f2≤0; and 1.55≤n7≤1.70, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; and n7 denotes a refractive index of the seventh lens.
 2. The camera optical lens as described in claim 1, further satisfying a following condition: 1.50≤d5/d6≤4.00, where d5 denotes an on-axis thickness of the third lens; and d6 denotes an on-axis distance from an image side surface of the third lens to an object side surface of the fourth lens.
 3. The camera optical lens as described in claim 1, further satisfying a following condition: 3.50≤f5/f6≤6.00, where f5 denotes a focal length of the fifth lens; and f6 denotes a focal length of the sixth lens.
 4. The camera optical lens as described in claim 1, further satisfying following conditions: −36.07≤(R1+R2)/(R1−R2)≤−8.17; and 0.02≤d1/TTL≤0.10, where R1 denotes a curvature radius of an object side surface of the first lens; R2 denotes a curvature radius of an image side surface of the first lens; d1 denotes an on-axis thickness of the first lens; and TTL denotes a total optical length from the object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 5. The camera optical lens as described in claim 1, further satisfying following conditions: −443.09≤f2/f≤−22.52; 18.63≤(R3+R4)/(R3−R4)≤141.75; and 0.01≤d3/TTL≤0.04, where R3 denotes a curvature radius of an object side surface of the second lens; R4 denotes a curvature radius of an image side surface of the second lens; d3 denotes an on-axis thickness of the second lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 6. The camera optical lens as described in claim 1, further satisfying following conditions: 0.50≤f3/f≤1.59; −0.41≤(R5+R6)/(R5−R6)≤−0.12; and 0.05≤d5/TTL≤0.15, where f3 denotes a focal length of the third lens; R5 denotes a curvature radius of an object side surface of the third lens; R6 denotes a curvature radius of an image side surface of the third lens; d5 denotes an on-axis thickness of the third lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 7. The camera optical lens as described in claim 1, further satisfying following conditions: −7.30≤f4/f≤−2.34; 1.62≤(R7+R8)/(R7−R8)≤5.02; and 0.01≤d7/TTL≤0.05, where f4 denotes a focal length of the fourth lens; R7 denotes a curvature radius of an object side surface of the fourth lens; R8 denotes a curvature radius of an image side surface of the fourth lens; d7 denotes an on-axis thickness of the fourth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 8. The camera optical lens as described in claim 1, further satisfying following conditions: −28.44≤f5/f≤−7.69; 1.86≤(R9+R10)/(R9−R10)≤6.84; and 0.02≤d9/TTL≤0.05, where f5 denotes a focal length of the fifth lens; R9 denotes a curvature radius of an object side surface of the fifth lens; R10 denotes a curvature radius of an image side surface of the fifth lens; d9 denotes an on-axis thickness of the fifth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 9. The camera optical lens as described in claim 1, further satisfying following conditions: −6.18≤f6/f≤−1.68; 2.04≤(R11+R12)/(R11−R12)≤7.94; and 0.03≤d11/TTL≤0.08, where f6 denotes a focal length of the sixth lens; R11 denotes a curvature radius of an object side surface of the sixth lens; R12 denotes a curvature radius of an image side surface of the sixth lens; d11 denotes an on-axis thickness of the sixth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 10. The camera optical lens as described in claim 1, further satisfying following conditions: 0.46≤f7/f≤1.47; −3.72≤(R13+R14)/(R13−R14)≤−0.82; and 0.04≤d13/TTL≤0.20, where f7 denotes a focal length of the seventh lens; R13 denotes a curvature radius of an object side surface of the seventh lens; R14 denotes a curvature radius of an image side surface of the seventh lens; d13 denotes an on-axis thickness of the seventh lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
 11. The camera optical lens as described in claim 1, further satisfying following conditions: −1.51≤f8/f≤−0.43; −0.94≤(R15+R16)/(R15−R16)≤−0.19; and 0.04≤d15/TTL≤0.22, where f8 denotes a focal length of the eighth lens; R15 denotes a curvature radius of an object side surface of the eighth lens; R16 denotes a curvature radius of an image side surface of the eighth lens; d15 denotes an on-axis thickness of the eighth lens; and TTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis. 